﻿BPO'GIIDA. 
  395 
  

  

  more 
  in 
  the 
  secondary 
  fibres) 
  than 
  is 
  the 
  case 
  with 
  the 
  mounting 
  

   which 
  the 
  Museum 
  possesses 
  from 
  Prof. 
  Schmidt. 
  The 
  spicules 
  are 
  

   chietly 
  acerate, 
  tapering 
  gradually 
  to 
  sliarp 
  points, 
  characters 
  which 
  

   I 
  have 
  already 
  described 
  iu 
  those 
  of 
  Schmidt's 
  specimen 
  (P. 
  Z, 
  S. 
  

   1881, 
  p. 
  114); 
  but 
  here 
  I 
  find 
  also 
  a 
  considerable 
  number 
  of 
  

   cylindricals, 
  in 
  some 
  places 
  with 
  well-rounded 
  extremities 
  ; 
  the 
  size 
  

   of 
  both 
  kinds 
  is 
  "OS 
  by 
  -0025 
  millim., 
  which 
  is 
  almost 
  exactly 
  the 
  

   size 
  I 
  gave 
  for 
  those 
  of 
  Schmidt's 
  slide 
  (I. 
  c. 
  p. 
  114). 
  On 
  re-exami- 
  

   nation 
  of 
  the 
  latter, 
  I 
  find 
  a 
  few 
  of 
  the 
  cylindricals 
  present 
  there 
  

   also, 
  and 
  the 
  position 
  of 
  the 
  spicules 
  in 
  the 
  fibre 
  is 
  normally 
  axial 
  

   on 
  the 
  whole, 
  and 
  not 
  superficial 
  only, 
  as 
  I 
  stated 
  in 
  the 
  paper 
  referred 
  

   to 
  : 
  I 
  was 
  misled 
  as 
  to 
  these 
  points 
  by 
  the 
  scantiness 
  and 
  badly 
  pre- 
  

   served 
  condition 
  of 
  the 
  small 
  mounting 
  which 
  represents 
  the 
  species. 
  

   Thus, 
  with 
  the 
  exception 
  of 
  the 
  more 
  strongly 
  spicular 
  character 
  

   of 
  the 
  fibre, 
  the 
  present 
  specimens 
  do 
  not 
  difter 
  essentially 
  from 
  

   West 
  Indian 
  specimens 
  of 
  the 
  species. 
  The 
  diameter 
  of 
  the 
  stem 
  varies 
  

   from 
  5 
  to 
  9 
  millim. 
  (exclusive 
  of 
  the 
  spines), 
  and 
  the 
  spines 
  are 
  strong, 
  

   viz. 
  2 
  to 
  3 
  millim. 
  high. 
  Vents 
  at 
  intervals 
  of 
  6 
  to 
  12 
  millim. 
  

   along 
  the 
  stem. 
  

  

  Hah. 
  Thursday 
  and 
  Alert 
  Islands, 
  Torres 
  Straits, 
  3-7 
  fms. 
  ; 
  Port 
  

   Denison, 
  Queensland, 
  4 
  fms. 
  

  

  Distribidion. 
  Caribbean 
  Sea 
  (Dach. 
  4' 
  J-^^'/i.) 
  ; 
  Florida, 
  9 
  fms. 
  

   (Schmidt). 
  

  

  It 
  is 
  interesting 
  to 
  have 
  such 
  a 
  well 
  authenticated 
  case 
  of 
  identity 
  

   of 
  a 
  "West-Indian 
  and 
  an 
  Australian 
  sponge. 
  

  

  23. 
  Cladochalina, 
  sp. 
  

  

  A 
  spirit-specimen, 
  of 
  sub-erect 
  habit, 
  with 
  stout 
  amber-yellow 
  

   horny 
  fibre 
  and 
  fusiform 
  acerates, 
  uni- 
  or 
  biserial, 
  measuring 
  '28 
  by 
  

   •OIG 
  millim. 
  Stem 
  subcylindrical, 
  about 
  12 
  millim. 
  thick, 
  without 
  

   surface 
  aculeations. 
  I 
  prefer 
  to 
  await 
  more 
  perfect 
  specimens 
  rather 
  

   than 
  risk 
  an 
  incorrect 
  determination 
  and 
  description. 
  

  

  Hab. 
  Prince 
  of 
  "Wales 
  Channel, 
  Torres 
  Straits, 
  5-7 
  fms. 
  ; 
  bottom 
  

   sand 
  and 
  shells. 
  

  

  24. 
  Cladochalina 
  nuda. 
  (Plate 
  XLI. 
  fig. 
  /.) 
  

   Decumbent. 
  Stems 
  solid, 
  slender, 
  tortuous 
  (branches? 
  ; 
  none 
  occur 
  

   in 
  the 
  specimens), 
  irregularly 
  cylindrical, 
  more 
  or 
  less 
  compressed 
  

   from 
  above 
  in 
  places, 
  especially 
  at 
  points 
  at 
  which 
  large 
  vents 
  occur; 
  

   generally 
  buUately 
  swollen 
  out 
  laterally 
  at 
  the 
  same 
  points 
  ; 
  diameter 
  

   irregular, 
  2 
  to 
  7, 
  or 
  5 
  to 
  9 
  millim. 
  in 
  diflerent 
  specimens. 
  Surface 
  

   even, 
  minutely 
  rough 
  to 
  the 
  touch, 
  with 
  occasional 
  low 
  pointed 
  pro- 
  

   jections. 
  Vents 
  uniscrial, 
  approximately 
  confined 
  to 
  upper 
  surface, 
  

   6 
  to 
  12 
  millim. 
  apart, 
  circular, 
  opening 
  level 
  with 
  the 
  surface, 
  or 
  

   occasionally 
  with 
  edges 
  drawn 
  up, 
  1 
  to 
  3 
  millim. 
  in 
  diameter, 
  1 
  to 
  

   3 
  millim. 
  deep; 
  walls 
  cavernous, 
  perforated 
  by 
  numerous 
  excretorv 
  

   canal-openings. 
  Texture 
  in 
  spirit 
  compressible, 
  but 
  resistent, 
  verv 
  

   elastic 
  ; 
  outer 
  wall 
  parchment-like, 
  tough 
  ; 
  colour 
  pale 
  umber-browii. 
  

  

  